Kind of strange, almost exactly 1 year after finding the adjustable Groton Carriage wrench, I just acquired a second style Groton. The patent for this one is a wild looking thing, and the wrench I have does not really look like it. But the name of the inventor was the President of Groton Carriage works at the time, so I'm positive it's based off the patent. When I bought it I thought it was incomplete, upon receiving it and studying it, I now believe it may be. I don't think they ever put the nut locking spring on it. I don't think their design was practical to do so. Patent # is 510,441, which, until I sent a message to Stan, was not known to have been produced.
I've been doing as much research as I can on the Groton Carriage Co., it seems they were a rather predominant carriage maker in the east for quite a number of years. Started in 1855, but only under that name since 1870, can't find a date where they went away, but I have found stuff where they were still going in 1900.
I hoping I can throw together a respectable shadowbox and bring them out to York in April.
Whether my wrench is complete or not, I know I have not seen another like it, and highly doubt I ever will.
The first picture is of both styles.